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Drag the question, move it to the X-ray bar, find the solution and drop it to the right answer.
Click on a square to the left of the X-ray bar and move it to the X-ray bar to reveal the arithmetic problem it contains. Once you determine what the answer to the problem is, move it over the square on the right side of the X-ray bar that contains the answer. Once you have the problem over its answer, drop the squire to place it. Move all problems to their answers to complete the level.
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